| Abstract: | We evaluate the melt-vapor surface tension (??) of natural, water-saturated dacite melt at 200 MPa, 950-1055??C, and 4.8-5.7 wt % H2O. We experimentally determine the critical supersaturation pressure for bubble nucleation as a function of dissolved water and then solve for ?? at those conditions using classical nucleation theory. The solutions obtained give dacite melt-vapor surface tensions that vary inversely with dissolved water from 0.042 (??0.003) J m-2 at 5.7 wt% H2O to 0.060 (??0.007) J m-2 at 5.2 wt% H2O to 0.073 (??0.003) J m-2 at 4.8 wt% H2O. Combining our dacite results with data from published hydrous haplogranite and high-silica rhyolite experiments reveals that melt-vapor surface tension also varies inversely with the concentration of mafic melt components (e.g., CaO, FeOtotal, MgO). We develop a thermodynamic context for these observations in which melt-vapor surface tension is represented by a balance of work terms controlled by melt structure. Overall, our results suggest that cooling, crystallization, and vapor exsolution cause systematic changes in ?? that should be considered in dynamic modeling of magmatic processes. |
| Genre: | Article |
| ProdID: | 70029093 |
| Citation Author: | Mangan, M.; Sisson, T. |
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| Citation End Page: | 9 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research B: Solid Earth |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Evolution of melt-vapor surface tension in silicic volcanic systems: Experiments with hydrous melts; 2005; Article; Journal; Journal of Geophysical Research B: Solid Earth; Mangan, M.; Sisson, T. |
| Citation Start Page: | 1 |
| Citation Volume: | 110 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Evolution of melt-vapor surface tension in silicic volcanic systems: Experiments with hydrous melts; 2005; Article; Journal; Journal of Geophysical Research B: Solid Earth; Mangan, M.; Sisson, T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1029/2004JB003215 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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